<?php
    /**
     * @package JAMA
     *    Pythagorean Theorem:
     *    a = 3
     *    b = 4
     *    r = sqrt(square(a) + square(b))
     *    r = 5
     *    r = sqrt(a^2 + b^2) without under/overflow.
     */
    function hypo($a, $b) {
        if (abs($a) > abs($b)) {
            $r = $b / $a;
            $r = abs($a) * sqrt(1 + $r * $r);
        } elseif ($b != 0) {
            $r = $a / $b;
            $r = abs($b) * sqrt(1 + $r * $r);
        } else {
            $r = 0.0;
        }
        return $r;
    }    //    function hypo()
    /**
     *    Mike Bommarito's version.
     *    Compute n-dimensional hyotheneuse.
     * function hypot() {
     * $s = 0;
     * foreach (func_get_args() as $d) {
     * if (is_numeric($d)) {
     * $s += pow($d, 2);
     * } else {
     * throw new PHPExcel_Calculation_Exception(JAMAError(ARGUMENT_TYPE_EXCEPTION));
     * }
     * }
     * return sqrt($s);
     * }
     */
